Mercurial > thymian

annotate common/date/tz_private.h @ 0:a4671277546c tip

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
created the repository for the thymian project
author ferencd
date Tue, 17 Aug 2021 11:19:54 +0200
parents
children
rev   line source
ferencd@0 1 #ifndef TZ_PRIVATE_H
ferencd@0 2 #define TZ_PRIVATE_H
ferencd@0 3
ferencd@0 4 // The MIT License (MIT)
ferencd@0 5 //
ferencd@0 6 // Copyright (c) 2015, 2016 Howard Hinnant
ferencd@0 7 //
ferencd@0 8 // Permission is hereby granted, free of charge, to any person obtaining a copy
ferencd@0 9 // of this software and associated documentation files (the "Software"), to deal
ferencd@0 10 // in the Software without restriction, including without limitation the rights
ferencd@0 11 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
ferencd@0 12 // copies of the Software, and to permit persons to whom the Software is
ferencd@0 13 // furnished to do so, subject to the following conditions:
ferencd@0 14 //
ferencd@0 15 // The above copyright notice and this permission notice shall be included in all
ferencd@0 16 // copies or substantial portions of the Software.
ferencd@0 17 //
ferencd@0 18 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
ferencd@0 19 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
ferencd@0 20 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
ferencd@0 21 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
ferencd@0 22 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
ferencd@0 23 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
ferencd@0 24 // SOFTWARE.
ferencd@0 25 //
ferencd@0 26 // Our apologies. When the previous paragraph was written, lowercase had not yet
ferencd@0 27 // been invented (that would involve another several millennia of evolution).
ferencd@0 28 // We did not mean to shout.
ferencd@0 29
ferencd@0 30 #if !defined(_MSC_VER) || (_MSC_VER >= 1900)
ferencd@0 31 #include "tz.h"
ferencd@0 32 #else
ferencd@0 33 #include "date.h"
ferencd@0 34 #include <vector>
ferencd@0 35 #endif
ferencd@0 36
ferencd@0 37 namespace date
ferencd@0 38 {
ferencd@0 39
ferencd@0 40 namespace detail
ferencd@0 41 {
ferencd@0 42
ferencd@0 43 #if !USE_OS_TZDB
ferencd@0 44
ferencd@0 45 enum class tz {utc, local, standard};
ferencd@0 46
ferencd@0 47 //forward declare to avoid warnings in gcc 6.2
ferencd@0 48 class MonthDayTime;
ferencd@0 49 std::istream& operator>>(std::istream& is, MonthDayTime& x);
ferencd@0 50 std::ostream& operator<<(std::ostream& os, const MonthDayTime& x);
ferencd@0 51
ferencd@0 52
ferencd@0 53 class MonthDayTime
ferencd@0 54 {
ferencd@0 55 private:
ferencd@0 56 struct pair
ferencd@0 57 {
ferencd@0 58 #if defined(_MSC_VER) && (_MSC_VER < 1900)
ferencd@0 59 pair() : month_day_(date::jan / 1), weekday_(0U) {}
ferencd@0 60
ferencd@0 61 pair(const date::month_day& month_day, const date::weekday& weekday)
ferencd@0 62 : month_day_(month_day), weekday_(weekday) {}
ferencd@0 63 #endif
ferencd@0 64
ferencd@0 65 date::month_day month_day_;
ferencd@0 66 date::weekday weekday_;
ferencd@0 67 };
ferencd@0 68
ferencd@0 69 enum Type {month_day, month_last_dow, lteq, gteq};
ferencd@0 70
ferencd@0 71 Type type_{month_day};
ferencd@0 72
ferencd@0 73 #if !defined(_MSC_VER) || (_MSC_VER >= 1900)
ferencd@0 74 union U
ferencd@0 75 #else
ferencd@0 76 struct U
ferencd@0 77 #endif
ferencd@0 78 {
ferencd@0 79 date::month_day month_day_;
ferencd@0 80 date::month_weekday_last month_weekday_last_;
ferencd@0 81 pair month_day_weekday_;
ferencd@0 82
ferencd@0 83 #if !defined(_MSC_VER) || (_MSC_VER >= 1900)
ferencd@0 84 U() : month_day_{date::jan/1} {}
ferencd@0 85 #else
ferencd@0 86 U() :
ferencd@0 87 month_day_(date::jan/1),
ferencd@0 88 month_weekday_last_(date::month(0U), date::weekday_last(date::weekday(0U)))
ferencd@0 89 {}
ferencd@0 90
ferencd@0 91 #endif // !defined(_MSC_VER) || (_MSC_VER >= 1900)
ferencd@0 92
ferencd@0 93 U& operator=(const date::month_day& x);
ferencd@0 94 U& operator=(const date::month_weekday_last& x);
ferencd@0 95 U& operator=(const pair& x);
ferencd@0 96 } u;
ferencd@0 97
ferencd@0 98 std::chrono::hours h_{};
ferencd@0 99 std::chrono::minutes m_{};
ferencd@0 100 std::chrono::seconds s_{};
ferencd@0 101 tz zone_{tz::local};
ferencd@0 102
ferencd@0 103 public:
ferencd@0 104 MonthDayTime() = default;
ferencd@0 105 MonthDayTime(local_seconds tp, tz timezone);
ferencd@0 106 MonthDayTime(const date::month_day& md, tz timezone);
ferencd@0 107
ferencd@0 108 date::day day() const;
ferencd@0 109 date::month month() const;
ferencd@0 110 tz zone() const {return zone_;}
ferencd@0 111
ferencd@0 112 void canonicalize(date::year y);
ferencd@0 113
ferencd@0 114 sys_seconds
ferencd@0 115 to_sys(date::year y, std::chrono::seconds offset, std::chrono::seconds save) const;
ferencd@0 116 sys_days to_sys_days(date::year y) const;
ferencd@0 117
ferencd@0 118 sys_seconds to_time_point(date::year y) const;
ferencd@0 119 int compare(date::year y, const MonthDayTime& x, date::year yx,
ferencd@0 120 std::chrono::seconds offset, std::chrono::minutes prev_save) const;
ferencd@0 121
ferencd@0 122 friend std::istream& operator>>(std::istream& is, MonthDayTime& x);
ferencd@0 123 friend std::ostream& operator<<(std::ostream& os, const MonthDayTime& x);
ferencd@0 124 };
ferencd@0 125
ferencd@0 126 // A Rule specifies one or more set of datetimes without using an offset.
ferencd@0 127 // Multiple dates are specified with multiple years. The years in effect
ferencd@0 128 // go from starting_year_ to ending_year_, inclusive. starting_year_ <=
ferencd@0 129 // ending_year_. save_ is in effect for times from the specified time
ferencd@0 130 // onward, including the specified time. When the specified time is
ferencd@0 131 // local, it uses the save_ from the chronologically previous Rule, or if
ferencd@0 132 // there is none, 0.
ferencd@0 133
ferencd@0 134 //forward declare to avoid warnings in gcc 6.2
ferencd@0 135 class Rule;
ferencd@0 136 bool operator==(const Rule& x, const Rule& y);
ferencd@0 137 bool operator<(const Rule& x, const Rule& y);
ferencd@0 138 bool operator==(const Rule& x, const date::year& y);
ferencd@0 139 bool operator<(const Rule& x, const date::year& y);
ferencd@0 140 bool operator==(const date::year& x, const Rule& y);
ferencd@0 141 bool operator<(const date::year& x, const Rule& y);
ferencd@0 142 bool operator==(const Rule& x, const std::string& y);
ferencd@0 143 bool operator<(const Rule& x, const std::string& y);
ferencd@0 144 bool operator==(const std::string& x, const Rule& y);
ferencd@0 145 bool operator<(const std::string& x, const Rule& y);
ferencd@0 146 std::ostream& operator<<(std::ostream& os, const Rule& r);
ferencd@0 147
ferencd@0 148 class Rule
ferencd@0 149 {
ferencd@0 150 private:
ferencd@0 151 std::string name_;
ferencd@0 152 date::year starting_year_{0};
ferencd@0 153 date::year ending_year_{0};
ferencd@0 154 MonthDayTime starting_at_;
ferencd@0 155 std::chrono::minutes save_{0};
ferencd@0 156 std::string abbrev_;
ferencd@0 157
ferencd@0 158 public:
ferencd@0 159 Rule() = default;
ferencd@0 160 explicit Rule(const std::string& s);
ferencd@0 161 Rule(const Rule& r, date::year starting_year, date::year ending_year);
ferencd@0 162
ferencd@0 163 const std::string& name() const {return name_;}
ferencd@0 164 const std::string& abbrev() const {return abbrev_;}
ferencd@0 165
ferencd@0 166 const MonthDayTime& mdt() const {return starting_at_;}
ferencd@0 167 const date::year& starting_year() const {return starting_year_;}
ferencd@0 168 const date::year& ending_year() const {return ending_year_;}
ferencd@0 169 const std::chrono::minutes& save() const {return save_;}
ferencd@0 170
ferencd@0 171 static void split_overlaps(std::vector<Rule>& rules);
ferencd@0 172
ferencd@0 173 friend bool operator==(const Rule& x, const Rule& y);
ferencd@0 174 friend bool operator<(const Rule& x, const Rule& y);
ferencd@0 175 friend bool operator==(const Rule& x, const date::year& y);
ferencd@0 176 friend bool operator<(const Rule& x, const date::year& y);
ferencd@0 177 friend bool operator==(const date::year& x, const Rule& y);
ferencd@0 178 friend bool operator<(const date::year& x, const Rule& y);
ferencd@0 179 friend bool operator==(const Rule& x, const std::string& y);
ferencd@0 180 friend bool operator<(const Rule& x, const std::string& y);
ferencd@0 181 friend bool operator==(const std::string& x, const Rule& y);
ferencd@0 182 friend bool operator<(const std::string& x, const Rule& y);
ferencd@0 183
ferencd@0 184 friend std::ostream& operator<<(std::ostream& os, const Rule& r);
ferencd@0 185
ferencd@0 186 private:
ferencd@0 187 date::day day() const;
ferencd@0 188 date::month month() const;
ferencd@0 189 static void split_overlaps(std::vector<Rule>& rules, std::size_t i, std::size_t& e);
ferencd@0 190 static bool overlaps(const Rule& x, const Rule& y);
ferencd@0 191 static void split(std::vector<Rule>& rules, std::size_t i, std::size_t k,
ferencd@0 192 std::size_t& e);
ferencd@0 193 };
ferencd@0 194
ferencd@0 195 inline bool operator!=(const Rule& x, const Rule& y) {return !(x == y);}
ferencd@0 196 inline bool operator> (const Rule& x, const Rule& y) {return y < x;}
ferencd@0 197 inline bool operator<=(const Rule& x, const Rule& y) {return !(y < x);}
ferencd@0 198 inline bool operator>=(const Rule& x, const Rule& y) {return !(x < y);}
ferencd@0 199
ferencd@0 200 inline bool operator!=(const Rule& x, const date::year& y) {return !(x == y);}
ferencd@0 201 inline bool operator> (const Rule& x, const date::year& y) {return y < x;}
ferencd@0 202 inline bool operator<=(const Rule& x, const date::year& y) {return !(y < x);}
ferencd@0 203 inline bool operator>=(const Rule& x, const date::year& y) {return !(x < y);}
ferencd@0 204
ferencd@0 205 inline bool operator!=(const date::year& x, const Rule& y) {return !(x == y);}
ferencd@0 206 inline bool operator> (const date::year& x, const Rule& y) {return y < x;}
ferencd@0 207 inline bool operator<=(const date::year& x, const Rule& y) {return !(y < x);}
ferencd@0 208 inline bool operator>=(const date::year& x, const Rule& y) {return !(x < y);}
ferencd@0 209
ferencd@0 210 inline bool operator!=(const Rule& x, const std::string& y) {return !(x == y);}
ferencd@0 211 inline bool operator> (const Rule& x, const std::string& y) {return y < x;}
ferencd@0 212 inline bool operator<=(const Rule& x, const std::string& y) {return !(y < x);}
ferencd@0 213 inline bool operator>=(const Rule& x, const std::string& y) {return !(x < y);}
ferencd@0 214
ferencd@0 215 inline bool operator!=(const std::string& x, const Rule& y) {return !(x == y);}
ferencd@0 216 inline bool operator> (const std::string& x, const Rule& y) {return y < x;}
ferencd@0 217 inline bool operator<=(const std::string& x, const Rule& y) {return !(y < x);}
ferencd@0 218 inline bool operator>=(const std::string& x, const Rule& y) {return !(x < y);}
ferencd@0 219
ferencd@0 220 struct zonelet
ferencd@0 221 {
ferencd@0 222 enum tag {has_rule, has_save, is_empty};
ferencd@0 223
ferencd@0 224 std::chrono::seconds gmtoff_;
ferencd@0 225 tag tag_ = has_rule;
ferencd@0 226
ferencd@0 227 #if !defined(_MSC_VER) || (_MSC_VER >= 1900)
ferencd@0 228 union U
ferencd@0 229 #else
ferencd@0 230 struct U
ferencd@0 231 #endif
ferencd@0 232 {
ferencd@0 233 std::string rule_;
ferencd@0 234 std::chrono::minutes save_;
ferencd@0 235
ferencd@0 236 ~U() {}
ferencd@0 237 U() {}
ferencd@0 238 U(const U&) {}
ferencd@0 239 U& operator=(const U&) = delete;
ferencd@0 240 } u;
ferencd@0 241
ferencd@0 242 std::string format_;
ferencd@0 243 date::year until_year_{0};
ferencd@0 244 MonthDayTime until_date_;
ferencd@0 245 sys_seconds until_utc_;
ferencd@0 246 local_seconds until_std_;
ferencd@0 247 local_seconds until_loc_;
ferencd@0 248 std::chrono::minutes initial_save_{};
ferencd@0 249 std::string initial_abbrev_;
ferencd@0 250 std::pair<const Rule*, date::year> first_rule_{nullptr, date::year::min()};
ferencd@0 251 std::pair<const Rule*, date::year> last_rule_{nullptr, date::year::max()};
ferencd@0 252
ferencd@0 253 ~zonelet();
ferencd@0 254 zonelet();
ferencd@0 255 zonelet(const zonelet& i);
ferencd@0 256 zonelet& operator=(const zonelet&) = delete;
ferencd@0 257 };
ferencd@0 258
ferencd@0 259 #else // USE_OS_TZDB
ferencd@0 260
ferencd@0 261 struct ttinfo
ferencd@0 262 {
ferencd@0 263 std::int32_t tt_gmtoff;
ferencd@0 264 unsigned char tt_isdst;
ferencd@0 265 unsigned char tt_abbrind;
ferencd@0 266 unsigned char pad[2];
ferencd@0 267 };
ferencd@0 268
ferencd@0 269 static_assert(sizeof(ttinfo) == 8, "");
ferencd@0 270
ferencd@0 271 struct expanded_ttinfo
ferencd@0 272 {
ferencd@0 273 std::chrono::seconds offset;
ferencd@0 274 std::string abbrev;
ferencd@0 275 bool is_dst;
ferencd@0 276 };
ferencd@0 277
ferencd@0 278 struct transition
ferencd@0 279 {
ferencd@0 280 sys_seconds timepoint;
ferencd@0 281 const expanded_ttinfo* info;
ferencd@0 282
ferencd@0 283 transition(sys_seconds tp, const expanded_ttinfo* i = nullptr)
ferencd@0 284 : timepoint(tp)
ferencd@0 285 , info(i)
ferencd@0 286 {}
ferencd@0 287
ferencd@0 288 friend
ferencd@0 289 std::ostream&
ferencd@0 290 operator<<(std::ostream& os, const transition& t)
ferencd@0 291 {
ferencd@0 292 using date::operator<<;
ferencd@0 293 os << t.timepoint << "Z ";
ferencd@0 294 if (t.info->offset >= std::chrono::seconds{0})
ferencd@0 295 os << '+';
ferencd@0 296 os << make_time(t.info->offset);
ferencd@0 297 if (t.info->is_dst > 0)
ferencd@0 298 os << " daylight ";
ferencd@0 299 else
ferencd@0 300 os << " standard ";
ferencd@0 301 os << t.info->abbrev;
ferencd@0 302 return os;
ferencd@0 303 }
ferencd@0 304 };
ferencd@0 305
ferencd@0 306 #endif // USE_OS_TZDB
ferencd@0 307
ferencd@0 308 } // namespace detail
ferencd@0 309
ferencd@0 310 } // namespace date
ferencd@0 311
ferencd@0 312 #if defined(_MSC_VER) && (_MSC_VER < 1900)
ferencd@0 313 #include "tz.h"
ferencd@0 314 #endif
ferencd@0 315
ferencd@0 316 #endif // TZ_PRIVATE_H